148 PH. O. F. VON MOELLENDOItEF ON [Feb. 20, 



artificial division of the genus as given by Pfeifter they might be 

 classed in Discartemon. 



4. Streptaxis (Oophana) bulbulus, Morelet. 



Streptaxis (Oophana) bulbulug, Tryon, Man. Pulm. i. p. 80, t. la. 

 figs. 41-43. 



Described from Pulo Condor. The single specimen from the 

 Samui group is rather more ventricose, the dimensions being 15 : 

 11-5 millim. instead of 16-5: 11 in the type. 



5. Stbept axis (Oophana) strangulatus, sp. nor. (Plate XVI. 

 fig. 5.) 



T. aperte umbilicata, ovata, sat tenuis, subtiliter arcuatim coshdata, 

 sericina, Ju/alina ; spira gulnregulariter ventroso-conica, apice 

 obtnso, glabrato. Anfr. 6, sat convexi ; ultimus paullum devians, 

 circa umbilicum compressus, obtuse carinatus, pone aperturam 

 subito coarctatus. Apertura pa/rum obliqua, truncato-ovalis ; 

 peristoma late expansum, tenue, intus callosum, ad insertionem 

 marginis externi attenuatum. Lamella parietalis valid a, sat 

 elevata ; dentibus 5, tino in parte super iore collumellce, 2 in 

 margine basali, 2 in margine externa oppositis. 

 Alt. 10*5, diam. 7*5 millim. 



Although certainly belonging to the group of the last species, 

 this peculiar form differs at once in the almost regular, hardly 

 deviating last whorl and the peculiar coarctation behind the mouth, 

 which calls to mind the similar formation in certain species of 

 Alycceus (Diori/x). The whorls also are more convex, the shell 

 is thinner, the peristome broader, and there are 5 teeth instead 

 of 3. 



Mr. Ancey is quite right in considering his group Oophana, of 

 which S. bulbulus is the type, to be a connecting-link between 

 Streptaxis and Ennea. In fact /S. strangulatus would at first sight 

 rather be considered as an Ennea by many, on account of its 

 regular shape. That this is, however, a Streptaxis and not an Ennea 

 may be inferred from young specimens, which show no teeth, 

 whilst all the young Ennea' are dentate. 



Fam. NaninidjE. 



G. Macrociilamts limbata, sp. nov. (Plate XVI. figs. 6, 7.) 



T. perforata, discoideo-depressa , solidula, subtiliter striatula, lincis 

 spiralibus nidlis, pellucida, nitens, pallide comeo-JJavescens, 

 subregulariter corneo-strigata. Anfr. (>, convexinsculi, lente ac- 

 crescentens, sutura profunda marginata discreti ; ultimus non 

 descendens, basi convexior, circa umbilicum excavatus. Apertura 

 fere verticalis, late ellijrtica, valde excisa ; peristoma extus 

 rectum, acutum, margine columellari levitcr reflexo, intus callo 

 latiusculo, sat crasso limbatum. 



Diam. ma). 10 22*5, min. 16-5-20, alt. 10-25 13'5 millim. 



